Inspect Wiring; Ground Fault Troubleshooting - Carrier AquaEdge 23XRV Start-Up, Operation And Maintenance Instructions Manual

7. Check that the wire size is within terminal specifications
and that the wires are tightened properly.
8. Check that specified branch circuit protection is installed
and correctly rated.
9. Check that the incoming power is within ± 10% of chiller
nameplate voltage.
10. All wiring should be installed in conformance with the
applicable local, national, and international codes (for
example, NEC/CEC). Verify that a properly sized ground
wire is installed and a suitable earth ground is used.
Check for and eliminate any grounds between the power
leads. Verify that all ground leads are unbroken.

Inspect Wiring

WARNING
Do not check the voltage supply without proper equipment
and precautions. Serious injury may result. Follow power
company recommendations.
CAUTION
Do not apply any kind of test voltage, even for a rotation
check, if the chiller is under a dehydration vacuum. Insula-
tion breakdown and serious damage may result.
1. Examine the wiring for conformance to the job wiring
diagrams and all applicable electrical codes. Confirm that
there is at least a 6-in. clearance surrounding the control
center louvers. Use an inspection mirror to visually
inspect the top of the power module to confirm that no
debris has fallen inside of it.
2. Connect a voltmeter across the power wires to the VFD
and measure the phase to phase and phase to ground
voltage. Compare this reading to the voltage rating on the
compressor and starter nameplates.
3. Compare the ampere ratings on the Machine Electrical
Data Nameplate. LOCKED ROTOR AMPS should be
equal to RATED LINE AMPS. OVERLOAD TRIP
AMPS should be equal to 1.08 x RATED LINE AMPS.
4. The control center must be wired to components and
terminals required for PIC III refrigeration control. Check
line side power and for control components shown on the
Certified Prints. The control center must share control of
cooler and condenser liquid pumps and cooling tower
fans.
5. Check the phase to phase and phase to ground line
voltage to the optional pumpout compressor. Compare
voltages against nameplate values. Refer to Fig. 48.
6. Ensure that fused disconnects or circuit breakers have
been supplied to the control center and optional pumpout
unit.
7. Ensure all electrical equipment and controls are properly
grounded in accordance with the job drawings, certified
drawings, and all applicable electrical codes.
8. Ensure the customer's contractor has verified proper oper-
ation of the pumps, cooling tower fans, and associated
auxiliary equipment. This includes ensuring motors are
properly lubricated and have proper electrical supply and
proper rotation.
9. Tighten all wiring connections on the high and low volt-
age terminal blocks in the control center enclosure above
and below the control panel.
10. Inspect the control panel in the control center enclosure to
ensure that the contractor has used the knockouts to feed
the wires into the back of the control panel. Wiring
through the top of the control center can cause debris to
fall into the power module. Clean and inspect the interior
of the control center if this has occurred. Contact Carrier
Service before applying power if debris may have fallen
inside of the power module.
a23-1555
Fig. 48 — Machine Electrical Data Nameplate
(Q,R Compressor Machine Label Shown)
Do not apply power unless a qualified Carrier technician is
present. Electrical shock could cause serious personal
injury or death.
11. Apply power to the control center. Go to the ICVC
and access the MENUSERVICEVFD CONFIG
DATAVFD_CONF screen. Confirm that the parame-
ters entered in VFD_CONF match the information on the
Machine Nameplate and Sales Requisition. Confirm that
the serial numbers on the chiller, Machine Nameplate,
and Sales Requisition are consistent.
Ground Fault Troubleshooting —
dure only if ground faults are declared:
Disconnect the motor leads from the control center before a
motor insulation test is performed. The voltage generated
from the testing equipment will damage the VFD.
Test the compressor motor and its power lead insulation re-
sistance with a 500-v insulation tester such as a megohmmeter.
74
WARNING
Use this proce-
CAUTION